Quercus Alba Bark Extract

Quercus alba (white oak) bark extract is a tannin-rich botanical astringent used at low percentages for oil control, pore feel, and soothing claims. While not a classic strong irritant, tannins and complex plant constituents can provoke stinging/dryness on compromised barriers and have documented potential for irritant or allergic contact dermatitis in sensitive individuals. Given the variability of botanical extracts and real-world eczema risk, it warrants a mild irritancy score rather than being treated as inherently “gentle.” Safety Notes: In commercial skincare, Quercus alba (white oak) bark extract is most often used as an astringent/soothing botanical at very low levels (trace to ~0.1%) in toners, lotions, aftershaves, and cleansers, where it functions as part of a broader botanical blend. Higher-strength consumer products such as targeted pore-refining/anti-blemish serums, post-shave treatments, and some deodorant/foot-care or scalp tonics can use single botanical extracts at ~1–5% (typically as the supplier’s extract solution), with practical upper limits driven by tannin-associated color/odor, potential irritation, and formula stability; rinse-off products can sometimes sit toward the upper end due to shorter contact time. No specific EU/FDA maximum is set for this botanical extract, so observed market use is primarily constrained by tolerability and aesthetic/formulation considerations.